The free software PuTTY can be used to create Secure Shell, Telnet, remote login, or serial interfaces to a server. However, there is a critical vulnerability in the software in question (CVE-2024-31497) that can be used to reconstruct SSH private keys. PuTTY versions 0.68 to 0.80 as well as other products (for example FileZilla) are directly affected by the vulnerability. 
The downside is that simply updating the products is not enough, as the keys may already be leaked.
PuTTY is free software for establishing connections via Secure Shell (SSH), Telnet, etc. It acts as a client and establishes the connection to a server. When the connection is established, the user's identity is verified using one of the provided authentication methods.
PuTTY versions 0,68 through 0,80 contain the critical vulnerability (CVE-2024-31497), which allows attackers to reconstruct the NIST P-521 private key using approximately 60 signatures. The vulnerability was discovered by Fabian Bäumer and Marcus Brinkmann (Ruhr University Bochum).
If you are interested in more details you can read the announcement at NIST.
https://nvd.nist.gov/vuln/detail/CVE-2024-31497
George is still wondering what he is doing here….
